Sifting device



Dec. 30. 1924. v 1,521,325

v y R. C. REYNOLDS `SIF'I'INGv DEVICE Filed Aug. 1. 192sv Patented Der:a 30, 1924.

UNITED STATES RAYMOND .REYNGL'DS 0F lVl-UNCIE; INDIANA.

sIFTinlG DEVICE.

Application vinea August 1,1923. sei-iai Np. 654,978'.

To all whom it may concern.: l

Be' it known that I, RAYMOND C. REY- Nonne, a citizen ofthe United States, residing at Muncie, inthe county of Delaware and State of Indiana, have invented certain new and useful Improvements iny Sitting Devices, of which the following is a specification.

This invention relates to sifting devices, and has especial `reterence tol appliances of this kind, as used in foundries. e

ln foundry work, there is the general use of the well known riddle consisting of va coarse sieve adapted to be manually manipulated vby the moulder. In' this prcatice, the sand having been si'fted into the mold flask, the riddle is emptied of its screenings and temporarily lain aside. After the mo'ld will have been tamped and completed, the riddle is again taken in hand by the moulder and the above described manipulations Vare repeated in the work of making up succeeding molds. Besides the physical strength exerted, there is consumed a considerable amount of time in thus handling the riddle, and moreover', it is not unusual for vthe riddle to become dama-ged vby being knocked about, or to 4become misplaced, thereby being not at all times in reliable condition or within easy reach.

To provide means to facilitate the rapid Vand expeditious handling and Ydeposit of the body or illing sand in the flask, and for the sifting or riddfling of the top course sand forl complet-ing the mold, `is the object of Athe present invention. The invention contemplates the arrangement off a riddle or sieve supported for operation above the flask, and connections whereby the riddle maybe swung to vand retained at position above, or at position removed from,

the flask.

My invention i'sembodied in the new construction, combination, and arrangement of parts shown in the annexed drawingsl and described in the following specification. The invention is defined in the appended claims.

iIn 1the drawings, the several prts of the invention are identified by suitable chaacters of reference applied to them in the different views, in which- Figure l is a top plan view of my improved sand sifting device.

Figure 2 is a side view of the invention.

Figure 3 is a vertical cross section view taken on the line 8--3 in Figure 2.

Figure 4 is a vertical cross section view taken on the line 4 4: in Figure 2.

Figure is ay view showing the position occupied by the invention, installed for use at the ordinary type of foundry bench.

Figure 6 is a. modified form of riddle bottom or screen in which a raised peripheral edge or wall is used, as distinguished from the fiat type screen or bottom shown in Figures l and 2.

The mechanism for carrying my invention into effect comprises a support and rocker bar retained 'for movement in a housing or guide block that is adapted to be secured at suitable position in proximity to the molding flask, a holder element, designated as a riddle frame, ariddle or screen removably retained in said frame, connections 'between t-he said frame and the rocker bar to permit the frame to be swung to and retained at extended or operative position, or to the retracted or inoperative position.

The utility of, and advantages accomplished by, the above described combi-nation and arrangement of parts will become apparent as the specilication of my invention proceeds.

The housing block may be made of any suitable metal, aluminumbeing the metal preferred, and it consists of the parallel side walls A and A retained at spaced distance apart by the integrally formed web B. Each of the flanges C is provided with a suitable aperture through which ordinary capV screws or bolts l and l may be passed and secured to a shelf or other suitable form of support 2 above the mouiders bench 3.

On suitable cross pins located at the power portion `of the front end, and at the upper portion of the rear end of the housing, are journaled the free running rollers F and G respectively.

IThe rocker bar H is about fifteen inches in length, and three `quarters of an inch thick and is disposed` between the walls of t-lie housing. Longitudinal'grooves'in the sides of the rocker bar minimize its weight and provide the lateral faces H1 which have free bearing against the inner sides of the said walls. The topV and bottom faces of said rocker bar have bearing against the ,rollers G and F respectively.

Disposed on the rear portion of the rocker bar to serve asa buffer or cushion when the rocker bar ispulled to the limit` of its forward movement, is a spring J. This spring may restloosely on the bar and is retained thereon. lby a cross pin H2 the protruding ends of which constitute abutments for the said spring. Similarly there is provided a spring K on the forward portion of the rocker bar, and which has bearingagainst the head member. This head-member of the rocker bar may bc of the integral form shown and is provided witli the arms L and L.

The riddle frame may be made Vof any desiredlgeneral form or size, and of any suitable material. It preferably consists of a sheet metal annular band M with beaded wire bound top rim, and an inturned bottom flange M1. The function of this frame is to retain removably, the riddle or sieve screen proper.V Divers forms of riddle frame and screen Abotto-ms may be used, depending upon the nature of the sand, andA of the molding to be done. A modified formy of screen is shown in Figure.

A form of screen useful and effective for general purposesconsists of a metal ring O of suitable diameter to be easily inserted into the frame band VM and to rest on the flange M1. The ends of the wires O1 constituting the screen fabric, are secured to the ring. O. Secured to the band .M of theV riddle frame,lis a connector head having armsv P and P which rest ontop of the armsrL and L of the rocker bar head. These pairs or arms are joined together in the manner of a hinge, by a loose pin 'Q having -a nut Q1 on its lower end and to bear against the underside ofthe lower arm L, and a coil spring R between the upper arm P and the head Q2 of the said pin. The tension provided by this spring, and the action of the recess in the lower 'arm l), as it engages the tooth L1 of the -hold the riddle frame at the position of alignment with the rocker bar, as shown in y Figure l and Figure 2.- The location of the said recess with reference to the tooth L1 is such that when the riddle is swung to the dotted line position (see Figure l) it is yieldably retained at-that. position. To stiifen the wall band M'of the riddle frame a reinforcing or stifening bar O2 may be fastened by the bolts S that'connect the connector head to the saidband.

My invention, 'installed forpractice, as

shown in F igureV 5, has the housing block fastened 'to the usual shelf 2 of the mould- 1, and in whichposition, the .space abovei the flask is unobstructed, so that the moulder may, with his shovel, deposit in the flask,

lhen the Y the bulk'of the sandneeded.

mold isin readiness to -receive the finer Y sand, the operator .grasps the handle vM1.

of the riddle frame and swings same to the forward or extended position wherek it is filled with its vquota of sand. The op.- erator then again grasps said handle M2 of the riddle and moves same backward f and forward. The weight of the-riddle and its contends being borne'by the rocker bar bearing against the rollers F and G, a free j and easy movement of the rocker bar is assured. The natural effort of the operator in moving the riddle back and forth isV unobstructed by any `stiffness or rigidity in `the device, and the action imparted to the riddle is of anundulating or raising and `lowering character, so that there Vis an effective rockingor tilting motion, resulting in the expeditious screening of the sand. Shock or impact. at the housingas the limits ofthe movement ofthe rocker bar are Y reached, is prevented bythe action of the y buffer springs J and K. y ,l

`By the usev of my invention, as just described, the shifting or riddling ofthe sand is accomplishedeifectively and very speedily. To discharge from theV riddle, the

screenings, the screen is liftedwith its contents, free from `the riddle frame and after being emptied is simply replaced at its normal position. The frequency. with which the screen is removed and einptiedfis Vdetermined v by the size. of the*V mesh and the character of the sand.l Ordinarily lthe emptying Y of the riddle screen V-occurs about every fourth or fifth mold constructed. Vrlhe screen may be provided with a handle O3 by which it may be easily liftedv from, the riddle frame.

A sand sifting device constructed in accordance with my invention is very economical of manufacture, and'is capable of being economically packed for transportation, and is easy to install. The housing, and also the rocker bar and head are of form not only effective as to strength and to perform the functions required of them, but are capable of being cast in molds of the simplest form. A minimum amount of machine work is required and preparing the parts, and the device is rugged and durable and not liable to derangement or breakage.

Claims.'

l. A sifting device, comprising a housing` block, a rocker bar mounted loosely therein, a riddle frame, a screen retained removably in the riddle frame, and a yieldable connection between the rocker bar and the riddle frame capable of retaining the riddle frame at varied positions of angularity to the rocker bar. Y

2. A sifting device, comprising a housing adapted to be secured at suitable position adjacent to the flask into which the sand is to be deposited, a rocker bar mountforward portion and upon which roller the rocker bar is adapted to rest, a roller jour naled above the rocker bar, and a roller journaled below the rocker bar at location at the rearward portion of the housing, a riddle, `yieldable connections between the rocker bar and the riddle to retain the riddle at varied positions of angularity to the rocker bar, and a buffer element between each end of the rocker bar and the said housing.

In testimony whereof I aHiX my signature.

RAYMOND C. REYNOLDS. 

